By Estelle Larsen All of the severe conditions that a person can suffer from always involve a major organ that the body needs to function properly. The lungs are the usual target of serious diseases. When this happens, the person can die instantly but there are also others who have survived but they need to have constant air supply for them to continue breathing. But now, through some major innovations moving around is now possible. By using a portable oxygen tank, those who are dependent to the tank can go to other places. This can be a hassle...